diff --git a/cmake/hwip.cmake b/cmake/hwip.cmake
index a22a2a1..dee8ff6 100644
--- a/cmake/hwip.cmake
+++ b/cmake/hwip.cmake
@@ -2,6 +2,7 @@
 include("${CMAKE_CURRENT_LIST_DIR}/utils/socmake_graph.cmake")
 include("${CMAKE_CURRENT_LIST_DIR}/utils/alias_dereference.cmake")
 include("${CMAKE_CURRENT_LIST_DIR}/utils/safe_get_target_property.cmake")
+include("${CMAKE_CURRENT_LIST_DIR}//utils/file_paths.cmake")
 
 #[[[
 # This function creates an INTERFACE library for a given IP.
@@ -227,6 +228,8 @@ endfunction()
 # existing list. Ne source files can also be prepended with the optional keyword PREPEND. The source
 # files are later used to create the list of files to be compiled (e.g., by a simulator) by a tool to
 # execute its tasks. The source files are passed as a list after the parameters and keywords.
+# 
+# Relative file paths are accepted and will be converted to absolute, relative to ${CMAKE_CURRENT_SOURCE_DIR}
 #
 # :param IP_LIB: The target IP library.
 # :type IP_LIB: string
@@ -240,24 +243,27 @@ endfunction()
 #]]
 function(ip_sources IP_LIB LANGUAGE)
     cmake_parse_arguments(ARG "PREPEND;REPLACE" "" "" ${ARGN})
+    # Delete PREPEND and REPLACE from argument list, so only sources are left
+    list(REMOVE_ITEM ARGN "PREPEND")
+    list(REMOVE_ITEM ARGN "REPLACE")
 
     check_languages(${LANGUAGE})
     # If alias IP is given, dereference it (VENDOR::LIB::IP::0.0.1) -> (VENDOR__LIB__IP__0.0.1)
     alias_dereference(_reallib ${IP_LIB})
 
+    # Convert all listed files to absolute paths relative to ${CMAKE_CURRENT_SOURCE_DIR}
+    convert_paths_to_absolute(file_list ${ARGN})
+
     if(NOT ARG_REPLACE)
         # Get the existing source files if any
         get_ip_sources(_sources ${_reallib} ${LANGUAGE} NO_DEPS)
-    else()
-        list(REMOVE_ITEM ARGN "REPLACE")
     endif()
 
-    # If the PREPEND option is passed first remove it from the list of file and prepend the new sources
+    # If the PREPEND option is passed prepend the new sources to the old ones
     if(ARG_PREPEND)
-        list(REMOVE_ITEM ARGN "PREPEND")
-        set(_sources ${ARGN} ${_sources})
+        set(_sources ${file_list} ${_sources})
     else()
-        set(_sources ${_sources} ${ARGN})
+        set(_sources ${_sources} ${file_list})
     endif()
     # Set the target property with the new list of source files
     set_property(TARGET ${_reallib} PROPERTY ${LANGUAGE}_SOURCES ${_sources})
@@ -316,8 +322,10 @@ function(ip_include_directories IP_LIB LANGUAGE)
     check_languages(${LANGUAGE})
     # If alias IP is given, dereference it (VENDOR::LIB::IP::0.0.1) -> (VENDOR__LIB__IP__0.0.1)
     alias_dereference(_reallib ${IP_LIB})
+    # Convert all listed files to absolute paths relative to ${CMAKE_CURRENT_SOURCE_DIR}
+    convert_paths_to_absolute(dir_list ${ARGN})
     # Append the new include directories to the exsiting ones
-    set_property(TARGET ${_reallib} APPEND PROPERTY ${LANGUAGE}_INCLUDE_DIRECTORIES ${ARGN})
+    set_property(TARGET ${_reallib} APPEND PROPERTY ${LANGUAGE}_INCLUDE_DIRECTORIES ${dir_list})
 endfunction()
 
 #[[[
diff --git a/cmake/utils/file_paths.cmake b/cmake/utils/file_paths.cmake
new file mode 100644
index 0000000..bf64087
--- /dev/null
+++ b/cmake/utils/file_paths.cmake
@@ -0,0 +1,22 @@
+#[[[
+# This function converts relative paths to absolute paths relative to ${CMAKE_CURRENT_SOURCE_DIR}
+# It replicates the behaviour of target_sources() CMake Function
+#
+# :param OUTPUT_LIST: The variable to store the output file list
+# :type OUTPUT_LIST: string
+# :param ARGN: list of files to convert
+# :type ARGN: path
+#
+#]]
+function(convert_paths_to_absolute OUTPUT_LIST)
+    unset(output_list)
+    foreach(path ${ARGN})
+        cmake_path(ABSOLUTE_PATH path 
+            BASE_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} NORMALIZE
+            OUTPUT_VARIABLE path
+        )
+        list(APPEND output_list ${path} )
+    endforeach()
+
+    set(${OUTPUT_LIST} ${output_list} PARENT_SCOPE)
+endfunction()
diff --git a/tests/tests/ip_include_directories/ip_include_directories_rel_path/ip_include_directories_rel_path.cmake b/tests/tests/ip_include_directories/ip_include_directories_rel_path/ip_include_directories_rel_path.cmake
new file mode 100644
index 0000000..fedb1c2
--- /dev/null
+++ b/tests/tests/ip_include_directories/ip_include_directories_rel_path/ip_include_directories_rel_path.cmake
@@ -0,0 +1,15 @@
+# Test relative include directories paths, the behaviour is matching the CMake behaviour of target_include_directories():
+# Changed in version 3.13: Relative source file paths are interpreted as being relative to the current source directory (i.e. CMAKE_CURRENT_SOURCE_DIR). See policy CMP0076.
+
+include("${CMAKE_CURRENT_LIST_DIR}/../../../../CMakeLists.txt")
+set(THIS_DIR ${CMAKE_CURRENT_LIST_DIR})
+
+set(TEST_NAME ip_include_directories_rel_path)
+ct_add_test(NAME ${TEST_NAME})
+function(${${TEST_NAME}})
+    execute_process(
+        COMMAND cmake -S ${THIS_DIR}/test
+                      -B ${CMAKE_BINARY_DIR}/${TEST_NAME}/build
+                      COMMAND_ERROR_IS_FATAL ANY
+                  )
+endfunction()
diff --git a/tests/tests/ip_include_directories/ip_include_directories_rel_path/test/CMakeLists.txt b/tests/tests/ip_include_directories/ip_include_directories_rel_path/test/CMakeLists.txt
new file mode 100644
index 0000000..a0a96f9
--- /dev/null
+++ b/tests/tests/ip_include_directories/ip_include_directories_rel_path/test/CMakeLists.txt
@@ -0,0 +1,31 @@
+# Test relative include directories paths, the behaviour is matching the CMake behaviour of target_include_directories():
+# Changed in version 3.13: Relative source file paths are interpreted as being relative to the current source directory (i.e. CMAKE_CURRENT_SOURCE_DIR). See policy CMP0076.
+
+cmake_minimum_required(VERSION 3.25)
+project(ip_include_directories_rel_path NONE)
+
+include("../../../../../SoCMakeConfig.cmake")
+
+add_ip(ip)
+
+set(SV_INCDIRS
+    .
+    justdir
+    )
+ip_include_directories(ip SYSTEMVERILOG
+    ${SV_INCDIRS}
+    )
+
+add_subdirectory(otherdir)
+include(incdir/incdir.cmake_)
+
+get_ip_include_directories(SV_ABS_INCDIRS ip SYSTEMVERILOG)
+
+foreach(abspath relpath IN ZIP_LISTS SV_ABS_INCDIRS SV_INCDIRS)
+    # If there is only . at the end, remove it, otherwise it wont match
+    string(REGEX REPLACE "\\.$" "" relpath ${relpath})
+    if(NOT "${CMAKE_CURRENT_SOURCE_DIR}/${relpath}" PATH_EQUAL ${abspath})
+        message(FATAL_ERROR "NOT EQUAL: ${CMAKE_CURRENT_SOURCE_DIR}/${relpath} - ${abspath}")
+    endif()
+
+endforeach()
diff --git a/tests/tests/ip_include_directories/ip_include_directories_rel_path/test/incdir/incdir.cmake_ b/tests/tests/ip_include_directories/ip_include_directories_rel_path/test/incdir/incdir.cmake_
new file mode 100644
index 0000000..7f69874
--- /dev/null
+++ b/tests/tests/ip_include_directories/ip_include_directories_rel_path/test/incdir/incdir.cmake_
@@ -0,0 +1,10 @@
+list(APPEND SV_INCDIRS
+    incdir/
+    incdir/incdir2
+    )
+ip_include_directories(ip SYSTEMVERILOG
+    incdir/
+    incdir/incdir2
+)
+
+set(SV_INCDIRS ${SV_INCDIRS} PARENT_SCOPE)
diff --git a/tests/tests/ip_include_directories/ip_include_directories_rel_path/test/otherdir/CMakeLists.txt b/tests/tests/ip_include_directories/ip_include_directories_rel_path/test/otherdir/CMakeLists.txt
new file mode 100644
index 0000000..4f146e7
--- /dev/null
+++ b/tests/tests/ip_include_directories/ip_include_directories_rel_path/test/otherdir/CMakeLists.txt
@@ -0,0 +1,10 @@
+list(APPEND SV_INCDIRS
+    otherdir/.
+    otherdir/incdir
+    )
+ip_include_directories(ip SYSTEMVERILOG
+    .
+    incdir
+    )
+
+set(SV_INCDIRS ${SV_INCDIRS} PARENT_SCOPE)
diff --git a/tests/tests/ip_link/ip_link1.cmake b/tests/tests/ip_link/ip_link1.cmake
index 04d506f..7cefc88 100644
--- a/tests/tests/ip_link/ip_link1.cmake
+++ b/tests/tests/ip_link/ip_link1.cmake
@@ -1,4 +1,5 @@
 include("${CMAKE_CURRENT_LIST_DIR}/../../../CMakeLists.txt")
+set(CDIR ${CMAKE_CURRENT_LIST_DIR})
 
 set(TEST_NAME ip_link1)
 
@@ -28,7 +29,7 @@ function(${${TEST_NAME}})
         LIBRARY lib
         VERSION 1.2.3
         )
-    ip_sources(${IP} VERILOG ip1_f1.v ip1_f2.v)
+    ip_sources(${IP} VERILOG ${CDIR}/ip1_f1.v ${CDIR}/ip1_f2.v)
     set(IP1 ${IP})
 
     add_ip(ip2
@@ -36,7 +37,7 @@ function(${${TEST_NAME}})
         LIBRARY lib
         VERSION 1.2.3
         )
-    ip_sources(${IP} VERILOG ip2_f1.v ip2_f2.v)
+    ip_sources(${IP} VERILOG ${CDIR}/ip2_f1.v ${CDIR}/ip2_f2.v)
     set(IP2 ${IP})
 
     add_ip(ip3
@@ -44,7 +45,7 @@ function(${${TEST_NAME}})
         LIBRARY lib
         VERSION 1.2.3
         )
-    ip_sources(${IP} VERILOG ip3_f1.v ip3_f2.v)
+    ip_sources(${IP} VERILOG ${CDIR}/ip3_f1.v ${CDIR}/ip3_f2.v)
     set(IP3 ${IP})
 
     add_ip(ip4
@@ -52,7 +53,7 @@ function(${${TEST_NAME}})
         LIBRARY lib
         VERSION 1.2.3
         )
-    ip_sources(${IP} VERILOG ip4_f1.v ip4_f2.v)
+    ip_sources(${IP} VERILOG ${CDIR}/ip4_f1.v ${CDIR}/ip4_f2.v)
     set(IP4 ${IP})
 
     ip_link(${IP1} ${IP2} ${IP3})
@@ -62,17 +63,17 @@ function(${${TEST_NAME}})
     get_ip_sources(V_SOURCES ${IP1} VERILOG)
 
     list(SUBLIST V_SOURCES 0 2 CURRENT_V_FILES)
-    ct_assert_equal(CURRENT_V_FILES "ip4_f1.v;ip4_f2.v")
+    ct_assert_equal(CURRENT_V_FILES "${CDIR}/ip4_f1.v;${CDIR}/ip4_f2.v")
 
     list(SUBLIST V_SOURCES 2 4 CURRENT_V_FILES)
-    if("${CURRENT_V_FILES}" STREQUAL "ip2_f1.v;ip2_f2.v;ip3_f1.v;ip3_f2.v")
+    if("${CURRENT_V_FILES}" STREQUAL "${CDIR}/ip2_f1.v;${CDIR}/ip2_f2.v;${CDIR}/ip3_f1.v;${CDIR}/ip3_f2.v")
         ct_assert_true(TRUE)
-    elseif("${CURRENT_V_FILES}" STREQUAL "ip3_f1.v;ip3_f2.v;ip3_f1.v;ip3_f2.v")
+    elseif("${CURRENT_V_FILES}" STREQUAL "${CDIR}/ip3_f1.v;${CDIR}/ip3_f2.v;${CDIR}/ip3_f1.v;${CDIR}/ip3_f2.v")
         ct_assert_true(TRUE)
     else()
         ct_assert_true(FALSE)
     endif()
 
     list(SUBLIST V_SOURCES 6 2 CURRENT_V_FILES)
-    ct_assert_equal(CURRENT_V_FILES "ip1_f1.v;ip1_f2.v")
+    ct_assert_equal(CURRENT_V_FILES "${CDIR}/ip1_f1.v;${CDIR}/ip1_f2.v")
 endfunction()
diff --git a/tests/tests/ip_sources/ip_sources.cmake b/tests/tests/ip_sources/ip_sources.cmake
index 4ad80e1..93fbd69 100644
--- a/tests/tests/ip_sources/ip_sources.cmake
+++ b/tests/tests/ip_sources/ip_sources.cmake
@@ -1,6 +1,7 @@
 include("${CMAKE_CURRENT_LIST_DIR}/../../../CMakeLists.txt")
 
 set(TEST_NAME ip_sources)
+set(CDIR ${CMAKE_CURRENT_LIST_DIR})
 
 ct_add_test(NAME ${TEST_NAME})
 function(${${TEST_NAME}})
@@ -11,48 +12,48 @@ function(${${TEST_NAME}})
         )
 
     ip_sources(${IP} SYSTEMVERILOG
-        svfile1.sv
-        svfile2.sv
+        ${CDIR}/svfile1.sv
+        ${CDIR}/svfile2.sv
         )
 
     ip_sources(${IP} VERILOG
-        vfile1.v
-        vfile2.v
+        ${CDIR}/vfile1.v
+        ${CDIR}/vfile2.v
         )
 
 # TEST SYSTEMVERILOG include directories
 
     get_ip_sources(SV_SOURCES ${IP} SYSTEMVERILOG)
     ct_assert_list(SV_SOURCES)
-    ct_assert_equal(SV_SOURCES "svfile1.sv;svfile2.sv")
+    ct_assert_equal(SV_SOURCES "${CDIR}/svfile1.sv;${CDIR}/svfile2.sv")
 
     ip_sources(${IP} SYSTEMVERILOG
-        svfile3.sv
-        svfile4.sv
+        ${CDIR}/svfile3.sv
+        ${CDIR}/svfile4.sv
         )
 
     get_ip_sources(SV_SOURCES ${IP} SYSTEMVERILOG)
     ct_assert_list(SV_SOURCES)
-    ct_assert_equal(SV_SOURCES "svfile1.sv;svfile2.sv;svfile3.sv;svfile4.sv")
+    ct_assert_equal(SV_SOURCES "${CDIR}/svfile1.sv;${CDIR}/svfile2.sv;${CDIR}/svfile3.sv;${CDIR}/svfile4.sv")
 
 
 # TEST VERILOG include directories
     get_ip_sources(V_SOURCES ${IP} VERILOG)
     ct_assert_list(V_SOURCES)
-    ct_assert_equal(V_SOURCES "vfile1.v;vfile2.v")
+    ct_assert_equal(V_SOURCES "${CDIR}/vfile1.v;${CDIR}/vfile2.v")
 
     ip_sources(${IP} VERILOG
-        vfile3.v
-        vfile4.v
+        ${CDIR}/vfile3.v
+        ${CDIR}/vfile4.v
         )
 
     get_ip_sources(V_SOURCES ${IP} VERILOG)
     ct_assert_list(V_SOURCES)
-    ct_assert_equal(V_SOURCES "vfile1.v;vfile2.v;vfile3.v;vfile4.v")
+    ct_assert_equal(V_SOURCES "${CDIR}/vfile1.v;${CDIR}/vfile2.v;${CDIR}/vfile3.v;${CDIR}/vfile4.v")
 
 # TEST Warning asserted on unknown language
     ip_sources(${IP} FAKELANG
-        fakelang.fake
+        ${CDIR}/fakelang.fake
         )
     ct_assert_prints("Language not supported: FAKELANG")
 
diff --git a/tests/tests/ip_sources/ip_sources_get_multilang.cmake b/tests/tests/ip_sources/ip_sources_get_multilang.cmake
index 8ca7d25..7ee769b 100644
--- a/tests/tests/ip_sources/ip_sources_get_multilang.cmake
+++ b/tests/tests/ip_sources/ip_sources_get_multilang.cmake
@@ -1,6 +1,7 @@
 include("${CMAKE_CURRENT_LIST_DIR}/../../../CMakeLists.txt")
 
 set(TEST_NAME ip_sources_get_multilang)
+set(CDIR ${CMAKE_CURRENT_LIST_DIR})
 
 ct_add_test(NAME ${TEST_NAME})
 function(${${TEST_NAME}})
@@ -11,31 +12,31 @@ function(${${TEST_NAME}})
         )
 
     ip_sources(${IP} SYSTEMVERILOG
-        svfile1.sv
-        svfile2.sv
+        ${CDIR}/svfile1.sv
+        ${CDIR}/svfile2.sv
         )
 
     ip_sources(${IP} VERILOG
-        vfile1.v
-        vfile2.v
+        ${CDIR}/vfile1.v
+        ${CDIR}/vfile2.v
         )
 
     ip_sources(${IP} VHDL
-        vhdlfile1.vhdl
-        vhdlfile2.vhdl
+        ${CDIR}/vhdlfile1.vhdl
+        ${CDIR}/vhdlfile2.vhdl
         )
 
     get_ip_sources(SOURCES ${IP} VERILOG SYSTEMVERILOG)
     ct_assert_list(SOURCES)
-    ct_assert_equal(SOURCES "vfile1.v;vfile2.v;svfile1.sv;svfile2.sv")
+    ct_assert_equal(SOURCES "${CDIR}/vfile1.v;${CDIR}/vfile2.v;${CDIR}/svfile1.sv;${CDIR}/svfile2.sv")
 
     get_ip_sources(SOURCES ${IP} VHDL SYSTEMVERILOG)
     ct_assert_list(SOURCES)
-    ct_assert_equal(SOURCES "vhdlfile1.vhdl;vhdlfile2.vhdl;svfile1.sv;svfile2.sv")
+    ct_assert_equal(SOURCES "${CDIR}/vhdlfile1.vhdl;${CDIR}/vhdlfile2.vhdl;${CDIR}/svfile1.sv;${CDIR}/svfile2.sv")
 
     get_ip_sources(SOURCES ${IP} VERILOG VHDL)
     ct_assert_list(SOURCES)
-    ct_assert_equal(SOURCES "vfile1.v;vfile2.v;vhdlfile1.vhdl;vhdlfile2.vhdl")
+    ct_assert_equal(SOURCES "${CDIR}/vfile1.v;${CDIR}/vfile2.v;${CDIR}/vhdlfile1.vhdl;${CDIR}/vhdlfile2.vhdl")
 
     add_ip(ip2
         VENDOR vendor
@@ -44,23 +45,23 @@ function(${${TEST_NAME}})
         )
 
     ip_sources(${IP} VERILOG
-        vfile3.v
-        vfile4.v
+        ${CDIR}/vfile3.v
+        ${CDIR}/vfile4.v
         )
 
     ip_sources(${IP} VHDL
-        vhdlfile3.vhdl
-        vhdlfile4.vhdl
+        ${CDIR}/vhdlfile3.vhdl
+        ${CDIR}/vhdlfile4.vhdl
         )
 
     ip_link(vendor::lib::ip::1.2.3 vendor::lib::ip2::1.2.4)
 
     get_ip_sources(SOURCES vendor::lib::ip::1.2.3 VERILOG VHDL SYSTEMVERILOG)
     ct_assert_list(SOURCES)
-    ct_assert_equal(SOURCES "vfile3.v;vfile4.v;vfile1.v;vfile2.v;vhdlfile3.vhdl;vhdlfile4.vhdl;vhdlfile1.vhdl;vhdlfile2.vhdl;svfile1.sv;svfile2.sv")
+    ct_assert_equal(SOURCES "${CDIR}/vfile3.v;${CDIR}/vfile4.v;${CDIR}/vfile1.v;${CDIR}/vfile2.v;${CDIR}/vhdlfile3.vhdl;${CDIR}/vhdlfile4.vhdl;${CDIR}/vhdlfile1.vhdl;${CDIR}/vhdlfile2.vhdl;${CDIR}/svfile1.sv;${CDIR}/svfile2.sv")
 
     get_ip_sources(SOURCES vendor::lib::ip::1.2.3 VERILOG VHDL SYSTEMVERILOG NO_DEPS)
     ct_assert_list(SOURCES)
-    ct_assert_equal(SOURCES "vfile1.v;vfile2.v;vhdlfile1.vhdl;vhdlfile2.vhdl;svfile1.sv;svfile2.sv")
+    ct_assert_equal(SOURCES "${CDIR}/vfile1.v;${CDIR}/vfile2.v;${CDIR}/vhdlfile1.vhdl;${CDIR}/vhdlfile2.vhdl;${CDIR}/svfile1.sv;${CDIR}/svfile2.sv")
 endfunction()
 
diff --git a/tests/tests/ip_sources/ip_sources_rel_path/ip_sources_rel_path.cmake b/tests/tests/ip_sources/ip_sources_rel_path/ip_sources_rel_path.cmake
new file mode 100644
index 0000000..f63416f
--- /dev/null
+++ b/tests/tests/ip_sources/ip_sources_rel_path/ip_sources_rel_path.cmake
@@ -0,0 +1,15 @@
+# Test relative source file paths, the behaviour is matching the CMake behaviour of target_sources:
+# Changed in version 3.13: Relative source file paths are interpreted as being relative to the current source directory (i.e. CMAKE_CURRENT_SOURCE_DIR). See policy CMP0076.
+
+include("${CMAKE_CURRENT_LIST_DIR}/../../../../CMakeLists.txt")
+set(THIS_DIR ${CMAKE_CURRENT_LIST_DIR})
+
+set(TEST_NAME ip_sources_rel_path)
+ct_add_test(NAME ${TEST_NAME})
+function(${${TEST_NAME}})
+    execute_process(
+        COMMAND cmake -S ${THIS_DIR}/test
+                      -B ${CMAKE_BINARY_DIR}/${TEST_NAME}/build
+                      COMMAND_ERROR_IS_FATAL ANY
+                  )
+endfunction()
diff --git a/tests/tests/ip_sources/ip_sources_rel_path/test/CMakeLists.txt b/tests/tests/ip_sources/ip_sources_rel_path/test/CMakeLists.txt
new file mode 100644
index 0000000..acd0779
--- /dev/null
+++ b/tests/tests/ip_sources/ip_sources_rel_path/test/CMakeLists.txt
@@ -0,0 +1,44 @@
+# Test relative source file paths, the behaviour is matching the CMake behaviour of target_sources:
+# Changed in version 3.13: Relative source file paths are interpreted as being relative to the current source directory (i.e. CMAKE_CURRENT_SOURCE_DIR). See policy CMP0076.
+
+cmake_minimum_required(VERSION 3.25)
+project(ip_sources_rel_path NONE)
+
+include("../../../../../SoCMakeConfig.cmake")
+
+add_ip(ip)
+
+set(SV_SOURCES
+    file.sv
+    file2.sv
+    justdir/file3.sv
+    )
+
+ip_sources(ip SYSTEMVERILOG
+    ${SV_SOURCES}
+    )
+
+set(VHDL_SOURCES
+    file.vhdl
+    file2.vhdl
+    justdir/file3.vhdl
+    )
+ip_sources(ip VHDL
+    ${VHDL_SOURCES}
+    )
+
+add_subdirectory(otherdir)
+include(incdir/incdir.cmake_)
+
+get_ip_sources(SV_ABS_SOURCES ip SYSTEMVERILOG)
+get_ip_sources(VHDL_ABS_SOURCES ip VHDL)
+
+set(LANGS "SV;VHDL")
+foreach(lang ${LANGS})
+    foreach(abspath relpath IN ZIP_LISTS ${lang}_ABS_SOURCES ${lang}_SOURCES)
+        if(NOT "${CMAKE_CURRENT_SOURCE_DIR}/${relpath}" PATH_EQUAL ${abspath})
+            message(FATAL_ERROR "NOT EQUAL: ${relpath} - ${abspath}")
+        endif()
+
+    endforeach()
+endforeach()
diff --git a/tests/tests/ip_sources/ip_sources_rel_path/test/file.sv b/tests/tests/ip_sources/ip_sources_rel_path/test/file.sv
new file mode 100644
index 0000000..e69de29
diff --git a/tests/tests/ip_sources/ip_sources_rel_path/test/file.vhdl b/tests/tests/ip_sources/ip_sources_rel_path/test/file.vhdl
new file mode 100644
index 0000000..e69de29
diff --git a/tests/tests/ip_sources/ip_sources_rel_path/test/file1.sv b/tests/tests/ip_sources/ip_sources_rel_path/test/file1.sv
new file mode 100644
index 0000000..e69de29
diff --git a/tests/tests/ip_sources/ip_sources_rel_path/test/file1.vhdl b/tests/tests/ip_sources/ip_sources_rel_path/test/file1.vhdl
new file mode 100644
index 0000000..e69de29
diff --git a/tests/tests/ip_sources/ip_sources_rel_path/test/incdir/incdir.cmake_ b/tests/tests/ip_sources/ip_sources_rel_path/test/incdir/incdir.cmake_
new file mode 100644
index 0000000..e64928c
--- /dev/null
+++ b/tests/tests/ip_sources/ip_sources_rel_path/test/incdir/incdir.cmake_
@@ -0,0 +1,10 @@
+
+ip_sources(ip SYSTEMVERILOG
+    incdir/incdir_file.sv)
+
+list(APPEND SV_SOURCES incdir/incdir_file.sv)
+
+ip_sources(ip VHDL
+    incdir/incdir_file.vhdl)
+
+list(APPEND VHDL_SOURCES incdir/incdir_file.vhdl)
diff --git a/tests/tests/ip_sources/ip_sources_rel_path/test/incdir/incdir_file.sv b/tests/tests/ip_sources/ip_sources_rel_path/test/incdir/incdir_file.sv
new file mode 100644
index 0000000..e69de29
diff --git a/tests/tests/ip_sources/ip_sources_rel_path/test/incdir/incdir_file.vhdl b/tests/tests/ip_sources/ip_sources_rel_path/test/incdir/incdir_file.vhdl
new file mode 100644
index 0000000..e69de29
diff --git a/tests/tests/ip_sources/ip_sources_rel_path/test/justdir/file3.sv b/tests/tests/ip_sources/ip_sources_rel_path/test/justdir/file3.sv
new file mode 100644
index 0000000..e69de29
diff --git a/tests/tests/ip_sources/ip_sources_rel_path/test/justdir/file3.vhdl b/tests/tests/ip_sources/ip_sources_rel_path/test/justdir/file3.vhdl
new file mode 100644
index 0000000..e69de29
diff --git a/tests/tests/ip_sources/ip_sources_rel_path/test/otherdir/CMakeLists.txt b/tests/tests/ip_sources/ip_sources_rel_path/test/otherdir/CMakeLists.txt
new file mode 100644
index 0000000..b515927
--- /dev/null
+++ b/tests/tests/ip_sources/ip_sources_rel_path/test/otherdir/CMakeLists.txt
@@ -0,0 +1,21 @@
+
+
+ip_sources(ip SYSTEMVERILOG
+    otherdir_file1.sv
+    otherdir_file2.sv
+    )
+list(APPEND SV_SOURCES 
+    otherdir/otherdir_file1.sv
+    otherdir/otherdir_file2.sv
+    )
+set(SV_SOURCES ${SV_SOURCES} PARENT_SCOPE)
+
+ip_sources(ip VHDL
+    otherdir_file1.vhdl
+    otherdir_file2.vhdl
+    )
+list(APPEND VHDL_SOURCES 
+    otherdir/otherdir_file1.vhdl
+    otherdir/otherdir_file2.vhdl
+    )
+set(VHDL_SOURCES ${VHDL_SOURCES} PARENT_SCOPE)
diff --git a/tests/tests/ip_sources/ip_sources_rel_path/test/otherdir/otherdir_file1.sv b/tests/tests/ip_sources/ip_sources_rel_path/test/otherdir/otherdir_file1.sv
new file mode 100644
index 0000000..e69de29
diff --git a/tests/tests/ip_sources/ip_sources_rel_path/test/otherdir/otherdir_file1.vhdl b/tests/tests/ip_sources/ip_sources_rel_path/test/otherdir/otherdir_file1.vhdl
new file mode 100644
index 0000000..e69de29
diff --git a/tests/tests/ip_sources/ip_sources_rel_path/test/otherdir/otherdir_file2.sv b/tests/tests/ip_sources/ip_sources_rel_path/test/otherdir/otherdir_file2.sv
new file mode 100644
index 0000000..e69de29
diff --git a/tests/tests/ip_sources/ip_sources_rel_path/test/otherdir/otherdir_file2.vhdl b/tests/tests/ip_sources/ip_sources_rel_path/test/otherdir/otherdir_file2.vhdl
new file mode 100644
index 0000000..e69de29